From 041d3a8cdc18dc375a128d90bbb753949a81b1fb Mon Sep 17 00:00:00 2001 From: Michal Nazarewicz Date: Thu, 29 Dec 2011 13:09:50 +0100 Subject: mm: page_alloc: introduce alloc_contig_range() This commit adds the alloc_contig_range() function which tries to allocate given range of pages. It tries to migrate all already allocated pages that fall in the range thus freeing them. Once all pages in the range are freed they are removed from the buddy system thus allocated for the caller to use. Signed-off-by: Michal Nazarewicz Signed-off-by: Marek Szyprowski Acked-by: Mel Gorman Reviewed-by: KAMEZAWA Hiroyuki Tested-by: Rob Clark Tested-by: Ohad Ben-Cohen Tested-by: Benjamin Gaignard Tested-by: Robert Nelson Tested-by: Barry Song --- include/linux/gfp.h | 8 ++++++++ 1 file changed, 8 insertions(+) (limited to 'include/linux/gfp.h') diff --git a/include/linux/gfp.h b/include/linux/gfp.h index 581e74b7df95..052a5b6cc4d0 100644 --- a/include/linux/gfp.h +++ b/include/linux/gfp.h @@ -391,4 +391,12 @@ static inline bool pm_suspended_storage(void) } #endif /* CONFIG_PM_SLEEP */ +#ifdef CONFIG_CMA + +/* The below functions must be run on a range from a single zone. */ +extern int alloc_contig_range(unsigned long start, unsigned long end); +extern void free_contig_range(unsigned long pfn, unsigned nr_pages); + +#endif + #endif /* __LINUX_GFP_H */ -- cgit v1.2.3